A: (1) Dialectical materialism holds that laws are objective and people have subjective initiative, which requires us to act in accordance with objective laws and give full play to subjective initiative in practical work, and combine respecting objective laws with giving full play to subjective initiative. (4 points) (2) The two sentences in the question illustrate the objectivity of the law, that is, the law is objective and does not depend on people's subjective will. Whether people know it, like it or deny it, it will work as long as conditions exist. (3 points) People's subjective initiative refers to people's unique abilities and activities, but the viewpoint in the title does not mention people's subjective initiative, so it does not reflect the relationship between people's objective regularity and subjective initiative. (3 points)
Key point: Xunzi's proposition is correct. The so-called "heaven" is the objective world, including both the natural world and the social world. The so-called "God never shuts one door but he opens another" means that both nature and society have their inherent laws of motion, which are objective and independent of human will, and cannot be changed by a wise monarch like Yao and an evil monarch like Jie. This understanding is in line with materialist dialectics.